exa2pro/starpu-max: porting work to Maxeler DFE @ b8f821babeb1ef2020c1e54c841864257846cf86

Samuel Thibault b8f821babe Add tasks_size_overhead output example		12 lat temu
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devel	2513a83028 Document handle and replicate refcounting	13 lat temu
doxygen	b8f821babe Add tasks_size_overhead output example	12 lat temu
texinfo	3cb866fcec Invert GPU-GPU direct transfer control environment variable name	12 lat temu
tutorial	579be68c99 use STARPU_MAIN_RAM instead of 0 to design main memory	12 lat temu
COPYING.GFDL	991ca7049f doc is licensed under GFDL	13 lat temu